Each other refers to two, one another to more than two. "Jones and Smith quarreled; they struck each other" is correct. "Jones, Smith and Brown quarreled; they struck one another" is also correct. Don't say, "The two boys teach one another" nor... Read more of EACH OTHERONE ANOTHER at Speaking Writing.comInformational Site Network Informational
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Steel Making

This steel like any other steel when distorted by cold worki...

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...

There is no mystery or secret about the proper annealing of d...

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

Making Steel Balls
Steel balls are made from rods or coils according to size, st...

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...

Phosphorus is one of the impurities in steel, and it has been...

Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...

The Packing Department
In Fig. 56 is shown the packing pots where the work is packe...

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...

An Automatic Temperature Control Pyrometer


Automatic temperature control instruments are similar to the Brown
indicating high resistance pyrometer with the exception that the
pointer is depressed at intervals of every 10 sec. upon contact-making
devices. No current passes through the pointer which simply depresses
the upper contact device tipped with platinum, which in turn comes
in contact with the lower contact device, platinum-tipped, and the
circuit is completed through these two contacts. The current is very
small, about 1/10 amp., as it is only necessary to operate the relay
which in turn operates the switch or valve. A small motor is used to
depress the pointer at regular intervals. The contact-making device
is adjustable throughout the scale range of the instrument, and an
index pointer indicates the point on the instrument at which the
temperature is being controlled. The space between the two contacts
on the high and low side, separated by insulating material, is
equivalent to 1 per cent of the scale range. A control of temperature
is therefore possible within 1 per cent of the total scale range.
Figure 131 shows this attached to a small furnace.

Next: Pyrometers For Molten Metal

Previous: Brown Automatic Signaling Pyrometer

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